摘要
采用精制棉和木浆为原料，研究了超声和不使用超声对羧甲基纤维素（CMC）取代度（DS）以及取代基团在葡萄糖残基的不同羟基位置分布的影响。结果表明：采用两种原料合成时，在较低取代区，超声波降低了羧甲基化程度；而在高取代区，超声波方法均能够有效提高羧甲基化程度。采用精制棉合成的CMC核磁结果分析表明：在较低取代区，超声比不超声的羧甲基取代均匀度高；而取代度在0．70～0．90范围内，超声和不超声的羧甲基取代均匀程度相近；在取代度大于0．90，超声比不超声的羧甲基取代均匀程度开始有所降低。
This paper adopted refined cotton and wood pulp as raw material, the influence of ultrasonic and without ultrasonic on the degree of substitution （DS） of carboxymethyl cellulose （CMC） and the substituent group distribution at different hydroxyl groups positions of the lucose residue was studied. Results showed that When the cellulose was synthesised with two kinds of raw materials, under the low degree of substitution, ultrasonic reduced the degree of carboxymethyl, but ultrasonic method could effectively improve the degree of carboxymethyl. CMC that was synthesised with refined cotton mri results show that under the low degree of substitution, ultrasonic carboxymethyl replaced higher uniformity than without ultrasonic, in the degree of substitution of 0.70~0.90, ultrasound carboxymethyl evenness degree was close to without ultrasound, in the substitution degree greater than 0.90, the ultrasonic carboxymethyl began to reduce evenness degree than without ultrasonic.
出处
《纤维素科学与技术》
CAS
CSCD
2014年第1期48-52,共5页
Journal of Cellulose Science and Technology
基金
北化集团青年科技创新专项项目(QKCZ-BIT-04)
关键词
羧甲基纤维素(CMC)
超声波
取代度(DS)
取代位置
黏度
carboxymethyl cellulose （CMC）
ultrasound
degree of substitution （DS）
position of substitution
viscosity
